- 2017–2018 Confirmed
2LT; high-back front buckets (AV5); footnote-digit-only (rule 11(d)): the 2017 guide's color and trim page (p.22) prints the code with the raised footnote mark 1 (includes Beige seat insert), and the 2018 guide's (GM Authority PDF copy, p.30) prints HH41; no page prints the bare code, so the row carries no factory citation
HH4 Confirmed
Documented applications
This page aggregates every documented appearance of HH4 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.